因以下原因：
一、資源或業(yè)務(wù)僅限中山大學(xué)教職員和學(xué)生訪問(wèn)（請(qǐng)?jiān)谛@網(wǎng)內(nèi)或通過(guò)VPN隧道訪問(wèn)），或
二、資源或業(yè)務(wù)不在服務(wù)時(shí)段（請(qǐng)?jiān)诜?wù)時(shí)段訪問(wèn)）。
1. The web page that you are trying to access is ONLY provided for students,faculty and staff of Sun Yat-sen University.
2. The website can ONLY be accessed during restricted hours.